Wireless communication circuit with a wideband received signal strength indicator
View Patent ↗It is an objective of the present invention to provide a circuit with a wideband received signal strength indicator, used for multiple systems. By using the switches and the analog-to-digital converter and the demodulator, the circuit of the present invention has the advantages of auto gain control, circuit size reduction and power-saving.
1. A wireless communication circuit with a wideband received signal strength indicator, comprising:
a front end signal processing unit, electrically connected to an antenna, configured to receive and process a wireless signal from the antenna and to output a low frequency analog signal;
a filter unit, electrically connected to the front end signal processing unit, and configured to receive the low frequency analog signal from the front end signal processing unit and to output a determined band signal;
a first analog-to-digital converter module, electrically connected to the filter unit, and configured to receive and transform the determined band signal from the filter unit into a first digital signal;
a first demodulator, electrically connected to the first analog-to-digital converter module and the front end signal processing unit, and configured to receive and demodulate the first digital signal from the first analog-to-digital converter module and to output a first control signal;
a second analog-to-digital converter module, selectively electrically connected to the front end signal processing unit or the filter unit, and configured to receive the low frequency analog signal from the front end signal processing unit or the determined band signal from the filter unit, and to transform the low frequency analog signal from the front end signal processing unit or the determined band signal from the filter unit into a second digital signal;
a second demodulator, electrically connected to the second analog-to-digital converter module, the first demodulator and the front end signal processing unit, and configured to receive and demodulate the second digital signal from the second analog-to-digital converter module and to output a second control signal;
a first switch, electrically connected between the front end signal processing unit and the second analog-to-digital converter module;
a second switch, electrically connected between the filter unit and the second analog-to-digital converter module;
a third switch, electrically connected between the second demodulator and the front end signal processing unit;
a fourth switch, electrically connected between the first demodulator and the front end signal processing unit; and
a controller, electrically connected to the first switch, the second switch, the third switch and the fourth switch, and configured to control a switching configuration of the first switch, the second switch, the third switch and the fourth switch to determine a circuit operation of the wireless communication circuit.
2. A wireless communication circuit with a wideband received signal strength indicator according to claim 1 , wherein the circuit is implemented within a single chip.
3. A wireless communication circuit with a wideband received signal strength indicator according to claim 1 , wherein the wireless communication circuit uses the second analog-to-digital converter and the second demodulator to be a wideband received signal strength indicator (WBRSSI) block to obtain the wideband received signal strength indicator (WBRSSI) when the first switch and the fourth switch are in an on state, and the second switch and the third switch are in an off state.
4. A wireless communication circuit with a wideband received signal strength indicator according to claim 1 , wherein the first analog-to-digital converter module comprises:
a first driver, having an input port and an output port, the input port electrically connected to an output port of the filter unit;
a second driver, having an input port and an output port, the input port electrically connected to the output port of the filter unit;
a first analog-to-digital converter, having an input port and an output port, the input port electrically connected to the output port of the first driver; and
a second analog-to-digital converter, having an input port and an output port, the input port electrically connected to the output port of the second driver.
5. A wireless communication circuit with a wideband received signal strength indicator according to claim 1 , wherein the second analog-to-digital converter module comprises:
a third driver, having an input port and an output port, the input port electrically connected to an output port of the front end signal processing unit through the first switch and the output port of the filter unit through the second switch;
a fourth driver, having an input port and an output port, the input port electrically connected to the output port of the front end signal processing unit through the first switch and the output port of the filter unit through the second switch;
a third analog-to-digital converter, having an input port and an output port, the input port electrically connected to the output port of the third driver; and
a fourth analog-to-digital converter, having an input port and an output port, the input port electrically connected to the output port of the fourth driver.
6. A wireless communication circuit with a wideband received signal strength indicator according to claim 1 , wherein the first demodulator comprises:
a first received signal strength indicator, having a first input port, a second input port and an output port, the first input port electrically connected to the output port of the first analog-to-digital converter, and the second input port electrically connected to the output port of the second analog-to-digital converter; and
a first auto gain controller, having a first input port, a second input port and an output port, the first input port electrically connected to the output port of the first received signal strength indicator, and the output port electrically connected to the front end signal processing unit through the forth switch.
7. A wireless communication circuit with a wideband received signal strength indicator according to claim 1 , wherein the second demodulator comprises:
a second received signal strength indicator, having a first input port, a second input port and an output port, the first input port electrically connected to the output port of the third analog-to-digital converter, and the second input port electrically connected to the output port of the fourth analog-to-digital converter, the output port electrically connected to the second input port of the first auto gain controller; and
a second auto gain controller, having an input port and an output port, the input port electrically connected to the output port of the second received signal strength indicator, and the output port electrically connected to the front end signal processing unit through the third switch.